1 /*
2 * EAP peer method: EAP-FAST (RFC 4851)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/tls.h"
13 #include "crypto/sha1.h"
14 #include "eap_common/eap_tlv_common.h"
15 #include "eap_i.h"
16 #include "eap_tls_common.h"
17 #include "eap_config.h"
18 #include "eap_fast_pac.h"
19
20 #ifdef EAP_FAST_DYNAMIC
21 #include "eap_fast_pac.c"
22 #endif /* EAP_FAST_DYNAMIC */
23
24 /* TODO:
25 * - test session resumption and enable it if it interoperates
26 * - password change (pending mschapv2 packet; replay decrypted packet)
27 */
28
29
30 static void eap_fast_deinit(struct eap_sm *sm, void *priv);
31
32
33 struct eap_fast_data {
34 struct eap_ssl_data ssl;
35
36 int fast_version;
37
38 const struct eap_method *phase2_method;
39 void *phase2_priv;
40 int phase2_success;
41
42 struct eap_method_type phase2_type;
43 struct eap_method_type *phase2_types;
44 size_t num_phase2_types;
45 int resuming; /* starting a resumed session */
46 struct eap_fast_key_block_provisioning *key_block_p;
47 #define EAP_FAST_PROV_UNAUTH 1
48 #define EAP_FAST_PROV_AUTH 2
49 int provisioning_allowed; /* Allowed PAC provisioning modes */
50 int provisioning; /* doing PAC provisioning (not the normal auth) */
51 int anon_provisioning; /* doing anonymous (unauthenticated)
52 * provisioning */
53 int session_ticket_used;
54
55 u8 key_data[EAP_FAST_KEY_LEN];
56 u8 *session_id;
57 size_t id_len;
58 u8 emsk[EAP_EMSK_LEN];
59 int success;
60
61 struct eap_fast_pac *pac;
62 struct eap_fast_pac *current_pac;
63 size_t max_pac_list_len;
64 int use_pac_binary_format;
65
66 u8 simck[EAP_FAST_SIMCK_LEN];
67 int simck_idx;
68
69 struct wpabuf *pending_phase2_req;
70 };
71
72
eap_fast_session_ticket_cb(void * ctx,const u8 * ticket,size_t len,const u8 * client_random,const u8 * server_random,u8 * master_secret)73 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
74 const u8 *client_random,
75 const u8 *server_random,
76 u8 *master_secret)
77 {
78 struct eap_fast_data *data = ctx;
79
80 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
81
82 if (client_random == NULL || server_random == NULL ||
83 master_secret == NULL) {
84 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
85 "back to full TLS handshake");
86 data->session_ticket_used = 0;
87 if (data->provisioning_allowed) {
88 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
89 "new PAC-Key");
90 data->provisioning = 1;
91 data->current_pac = NULL;
92 }
93 return 0;
94 }
95
96 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
97
98 if (data->current_pac == NULL) {
99 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
100 "using SessionTicket");
101 data->session_ticket_used = 0;
102 return 0;
103 }
104
105 eap_fast_derive_master_secret(data->current_pac->pac_key,
106 server_random, client_random,
107 master_secret);
108
109 data->session_ticket_used = 1;
110
111 return 1;
112 }
113
114
eap_fast_parse_phase1(struct eap_fast_data * data,const char * phase1)115 static int eap_fast_parse_phase1(struct eap_fast_data *data,
116 const char *phase1)
117 {
118 const char *pos;
119
120 pos = os_strstr(phase1, "fast_provisioning=");
121 if (pos) {
122 data->provisioning_allowed = atoi(pos + 18);
123 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
124 "mode: %d", data->provisioning_allowed);
125 }
126
127 pos = os_strstr(phase1, "fast_max_pac_list_len=");
128 if (pos) {
129 data->max_pac_list_len = atoi(pos + 22);
130 if (data->max_pac_list_len == 0)
131 data->max_pac_list_len = 1;
132 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
133 (unsigned long) data->max_pac_list_len);
134 }
135
136 pos = os_strstr(phase1, "fast_pac_format=binary");
137 if (pos) {
138 data->use_pac_binary_format = 1;
139 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
140 "list");
141 }
142
143 return 0;
144 }
145
146
eap_fast_init(struct eap_sm * sm)147 static void * eap_fast_init(struct eap_sm *sm)
148 {
149 struct eap_fast_data *data;
150 struct eap_peer_config *config = eap_get_config(sm);
151
152 data = os_zalloc(sizeof(*data));
153 if (data == NULL)
154 return NULL;
155 data->fast_version = EAP_FAST_VERSION;
156 data->max_pac_list_len = 10;
157
158 if (config && config->phase1 &&
159 eap_fast_parse_phase1(data, config->phase1) < 0) {
160 eap_fast_deinit(sm, data);
161 return NULL;
162 }
163
164 if (eap_peer_select_phase2_methods(config, "auth=",
165 &data->phase2_types,
166 &data->num_phase2_types) < 0) {
167 eap_fast_deinit(sm, data);
168 return NULL;
169 }
170
171 data->phase2_type.vendor = EAP_VENDOR_IETF;
172 data->phase2_type.method = EAP_TYPE_NONE;
173
174 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) {
175 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
176 eap_fast_deinit(sm, data);
177 return NULL;
178 }
179
180 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
181 eap_fast_session_ticket_cb,
182 data) < 0) {
183 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
184 "callback");
185 eap_fast_deinit(sm, data);
186 return NULL;
187 }
188
189 /*
190 * The local RADIUS server in a Cisco AP does not seem to like empty
191 * fragments before data, so disable that workaround for CBC.
192 * TODO: consider making this configurable
193 */
194 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
195 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
196 "workarounds");
197 }
198
199 if (data->use_pac_binary_format &&
200 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
201 eap_fast_deinit(sm, data);
202 return NULL;
203 }
204
205 if (!data->use_pac_binary_format &&
206 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
207 eap_fast_deinit(sm, data);
208 return NULL;
209 }
210 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
211
212 if (data->pac == NULL && !data->provisioning_allowed) {
213 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
214 "provisioning disabled");
215 eap_fast_deinit(sm, data);
216 return NULL;
217 }
218
219 return data;
220 }
221
222
eap_fast_deinit(struct eap_sm * sm,void * priv)223 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
224 {
225 struct eap_fast_data *data = priv;
226 struct eap_fast_pac *pac, *prev;
227
228 if (data == NULL)
229 return;
230 if (data->phase2_priv && data->phase2_method)
231 data->phase2_method->deinit(sm, data->phase2_priv);
232 os_free(data->phase2_types);
233 os_free(data->key_block_p);
234 eap_peer_tls_ssl_deinit(sm, &data->ssl);
235
236 pac = data->pac;
237 prev = NULL;
238 while (pac) {
239 prev = pac;
240 pac = pac->next;
241 eap_fast_free_pac(prev);
242 }
243 os_free(data->session_id);
244 wpabuf_free(data->pending_phase2_req);
245 os_free(data);
246 }
247
248
eap_fast_derive_msk(struct eap_fast_data * data)249 static int eap_fast_derive_msk(struct eap_fast_data *data)
250 {
251 eap_fast_derive_eap_msk(data->simck, data->key_data);
252 eap_fast_derive_eap_emsk(data->simck, data->emsk);
253 data->success = 1;
254 return 0;
255 }
256
257
eap_fast_derive_key_auth(struct eap_sm * sm,struct eap_fast_data * data)258 static void eap_fast_derive_key_auth(struct eap_sm *sm,
259 struct eap_fast_data *data)
260 {
261 u8 *sks;
262
263 /* RFC 4851, Section 5.1:
264 * Extra key material after TLS key_block: session_key_seed[40]
265 */
266
267 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
268 EAP_FAST_SKS_LEN);
269 if (sks == NULL) {
270 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
271 "session_key_seed");
272 return;
273 }
274
275 /*
276 * RFC 4851, Section 5.2:
277 * S-IMCK[0] = session_key_seed
278 */
279 wpa_hexdump_key(MSG_DEBUG,
280 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
281 sks, EAP_FAST_SKS_LEN);
282 data->simck_idx = 0;
283 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
284 os_free(sks);
285 }
286
287
eap_fast_derive_key_provisioning(struct eap_sm * sm,struct eap_fast_data * data)288 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
289 struct eap_fast_data *data)
290 {
291 os_free(data->key_block_p);
292 data->key_block_p = (struct eap_fast_key_block_provisioning *)
293 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
294 "key expansion",
295 sizeof(*data->key_block_p));
296 if (data->key_block_p == NULL) {
297 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
298 return;
299 }
300 /*
301 * RFC 4851, Section 5.2:
302 * S-IMCK[0] = session_key_seed
303 */
304 wpa_hexdump_key(MSG_DEBUG,
305 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
306 data->key_block_p->session_key_seed,
307 sizeof(data->key_block_p->session_key_seed));
308 data->simck_idx = 0;
309 os_memcpy(data->simck, data->key_block_p->session_key_seed,
310 EAP_FAST_SIMCK_LEN);
311 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
312 data->key_block_p->server_challenge,
313 sizeof(data->key_block_p->server_challenge));
314 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
315 data->key_block_p->client_challenge,
316 sizeof(data->key_block_p->client_challenge));
317 }
318
319
eap_fast_derive_keys(struct eap_sm * sm,struct eap_fast_data * data)320 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
321 {
322 if (data->anon_provisioning)
323 eap_fast_derive_key_provisioning(sm, data);
324 else
325 eap_fast_derive_key_auth(sm, data);
326 }
327
328
eap_fast_init_phase2_method(struct eap_sm * sm,struct eap_fast_data * data)329 static int eap_fast_init_phase2_method(struct eap_sm *sm,
330 struct eap_fast_data *data)
331 {
332 data->phase2_method =
333 eap_peer_get_eap_method(data->phase2_type.vendor,
334 data->phase2_type.method);
335 if (data->phase2_method == NULL)
336 return -1;
337
338 if (data->key_block_p) {
339 sm->auth_challenge = data->key_block_p->server_challenge;
340 sm->peer_challenge = data->key_block_p->client_challenge;
341 }
342 sm->init_phase2 = 1;
343 data->phase2_priv = data->phase2_method->init(sm);
344 sm->init_phase2 = 0;
345 sm->auth_challenge = NULL;
346 sm->peer_challenge = NULL;
347
348 return data->phase2_priv == NULL ? -1 : 0;
349 }
350
351
eap_fast_select_phase2_method(struct eap_fast_data * data,u8 type)352 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
353 {
354 size_t i;
355
356 /* TODO: TNC with anonymous provisioning; need to require both
357 * completed MSCHAPv2 and TNC */
358
359 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
360 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
361 "during unauthenticated provisioning; reject phase2"
362 " type %d", type);
363 return -1;
364 }
365
366 #ifdef EAP_TNC
367 if (type == EAP_TYPE_TNC) {
368 data->phase2_type.vendor = EAP_VENDOR_IETF;
369 data->phase2_type.method = EAP_TYPE_TNC;
370 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
371 "vendor %d method %d for TNC",
372 data->phase2_type.vendor,
373 data->phase2_type.method);
374 return 0;
375 }
376 #endif /* EAP_TNC */
377
378 for (i = 0; i < data->num_phase2_types; i++) {
379 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
380 data->phase2_types[i].method != type)
381 continue;
382
383 data->phase2_type.vendor = data->phase2_types[i].vendor;
384 data->phase2_type.method = data->phase2_types[i].method;
385 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
386 "vendor %d method %d",
387 data->phase2_type.vendor,
388 data->phase2_type.method);
389 break;
390 }
391
392 if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
393 return -1;
394
395 return 0;
396 }
397
398
eap_fast_phase2_request(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,struct eap_hdr * hdr,struct wpabuf ** resp)399 static int eap_fast_phase2_request(struct eap_sm *sm,
400 struct eap_fast_data *data,
401 struct eap_method_ret *ret,
402 struct eap_hdr *hdr,
403 struct wpabuf **resp)
404 {
405 size_t len = be_to_host16(hdr->length);
406 u8 *pos;
407 struct eap_method_ret iret;
408 struct eap_peer_config *config = eap_get_config(sm);
409 struct wpabuf msg;
410
411 if (len <= sizeof(struct eap_hdr)) {
412 wpa_printf(MSG_INFO, "EAP-FAST: too short "
413 "Phase 2 request (len=%lu)", (unsigned long) len);
414 return -1;
415 }
416 pos = (u8 *) (hdr + 1);
417 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
418 if (*pos == EAP_TYPE_IDENTITY) {
419 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
420 return 0;
421 }
422
423 if (data->phase2_priv && data->phase2_method &&
424 *pos != data->phase2_type.method) {
425 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
426 "deinitialize previous method");
427 data->phase2_method->deinit(sm, data->phase2_priv);
428 data->phase2_method = NULL;
429 data->phase2_priv = NULL;
430 data->phase2_type.vendor = EAP_VENDOR_IETF;
431 data->phase2_type.method = EAP_TYPE_NONE;
432 }
433
434 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
435 data->phase2_type.method == EAP_TYPE_NONE &&
436 eap_fast_select_phase2_method(data, *pos) < 0) {
437 if (eap_peer_tls_phase2_nak(data->phase2_types,
438 data->num_phase2_types,
439 hdr, resp))
440 return -1;
441 return 0;
442 }
443
444 if ((data->phase2_priv == NULL &&
445 eap_fast_init_phase2_method(sm, data) < 0) ||
446 data->phase2_method == NULL) {
447 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
448 "Phase 2 EAP method %d", *pos);
449 ret->methodState = METHOD_DONE;
450 ret->decision = DECISION_FAIL;
451 return -1;
452 }
453
454 os_memset(&iret, 0, sizeof(iret));
455 wpabuf_set(&msg, hdr, len);
456 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
457 &msg);
458 if (*resp == NULL ||
459 (iret.methodState == METHOD_DONE &&
460 iret.decision == DECISION_FAIL)) {
461 ret->methodState = METHOD_DONE;
462 ret->decision = DECISION_FAIL;
463 } else if ((iret.methodState == METHOD_DONE ||
464 iret.methodState == METHOD_MAY_CONT) &&
465 (iret.decision == DECISION_UNCOND_SUCC ||
466 iret.decision == DECISION_COND_SUCC)) {
467 data->phase2_success = 1;
468 }
469
470 if (*resp == NULL && config &&
471 (config->pending_req_identity || config->pending_req_password ||
472 config->pending_req_otp || config->pending_req_new_password)) {
473 wpabuf_free(data->pending_phase2_req);
474 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
475 } else if (*resp == NULL)
476 return -1;
477
478 return 0;
479 }
480
481
eap_fast_tlv_nak(int vendor_id,int tlv_type)482 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
483 {
484 struct wpabuf *buf;
485 struct eap_tlv_nak_tlv *nak;
486 buf = wpabuf_alloc(sizeof(*nak));
487 if (buf == NULL)
488 return NULL;
489 nak = wpabuf_put(buf, sizeof(*nak));
490 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
491 nak->length = host_to_be16(6);
492 nak->vendor_id = host_to_be32(vendor_id);
493 nak->nak_type = host_to_be16(tlv_type);
494 return buf;
495 }
496
497
eap_fast_tlv_result(int status,int intermediate)498 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
499 {
500 struct wpabuf *buf;
501 struct eap_tlv_intermediate_result_tlv *result;
502 buf = wpabuf_alloc(sizeof(*result));
503 if (buf == NULL)
504 return NULL;
505 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
506 intermediate ? "Intermediate " : "", status);
507 result = wpabuf_put(buf, sizeof(*result));
508 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
509 (intermediate ?
510 EAP_TLV_INTERMEDIATE_RESULT_TLV :
511 EAP_TLV_RESULT_TLV));
512 result->length = host_to_be16(2);
513 result->status = host_to_be16(status);
514 return buf;
515 }
516
517
eap_fast_tlv_pac_ack(void)518 static struct wpabuf * eap_fast_tlv_pac_ack(void)
519 {
520 struct wpabuf *buf;
521 struct eap_tlv_result_tlv *res;
522 struct eap_tlv_pac_ack_tlv *ack;
523
524 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
525 if (buf == NULL)
526 return NULL;
527
528 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
529 ack = wpabuf_put(buf, sizeof(*ack));
530 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
531 EAP_TLV_TYPE_MANDATORY);
532 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
533 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
534 ack->pac_len = host_to_be16(2);
535 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
536
537 return buf;
538 }
539
540
eap_fast_process_eap_payload_tlv(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,u8 * eap_payload_tlv,size_t eap_payload_tlv_len)541 static struct wpabuf * eap_fast_process_eap_payload_tlv(
542 struct eap_sm *sm, struct eap_fast_data *data,
543 struct eap_method_ret *ret,
544 u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
545 {
546 struct eap_hdr *hdr;
547 struct wpabuf *resp = NULL;
548
549 if (eap_payload_tlv_len < sizeof(*hdr)) {
550 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
551 "Payload TLV (len=%lu)",
552 (unsigned long) eap_payload_tlv_len);
553 return NULL;
554 }
555
556 hdr = (struct eap_hdr *) eap_payload_tlv;
557 if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
558 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
559 "EAP Payload TLV");
560 return NULL;
561 }
562
563 if (hdr->code != EAP_CODE_REQUEST) {
564 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
565 "Phase 2 EAP header", hdr->code);
566 return NULL;
567 }
568
569 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
570 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
571 "failed");
572 return NULL;
573 }
574
575 return eap_fast_tlv_eap_payload(resp);
576 }
577
578
eap_fast_validate_crypto_binding(struct eap_tlv_crypto_binding_tlv * _bind)579 static int eap_fast_validate_crypto_binding(
580 struct eap_tlv_crypto_binding_tlv *_bind)
581 {
582 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
583 "Received Version %d SubType %d",
584 _bind->version, _bind->received_version, _bind->subtype);
585 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
586 _bind->nonce, sizeof(_bind->nonce));
587 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
588 _bind->compound_mac, sizeof(_bind->compound_mac));
589
590 if (_bind->version != EAP_FAST_VERSION ||
591 _bind->received_version != EAP_FAST_VERSION ||
592 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
593 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
594 "Crypto-Binding TLV: Version %d "
595 "Received Version %d SubType %d",
596 _bind->version, _bind->received_version,
597 _bind->subtype);
598 return -1;
599 }
600
601 return 0;
602 }
603
604
eap_fast_write_crypto_binding(struct eap_tlv_crypto_binding_tlv * rbind,struct eap_tlv_crypto_binding_tlv * _bind,const u8 * cmk)605 static void eap_fast_write_crypto_binding(
606 struct eap_tlv_crypto_binding_tlv *rbind,
607 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
608 {
609 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
610 EAP_TLV_CRYPTO_BINDING_TLV);
611 rbind->length = host_to_be16(sizeof(*rbind) -
612 sizeof(struct eap_tlv_hdr));
613 rbind->version = EAP_FAST_VERSION;
614 rbind->received_version = _bind->version;
615 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
616 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
617 inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
618 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
619 rbind->compound_mac);
620
621 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
622 "Received Version %d SubType %d",
623 rbind->version, rbind->received_version, rbind->subtype);
624 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
625 rbind->nonce, sizeof(rbind->nonce));
626 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
627 rbind->compound_mac, sizeof(rbind->compound_mac));
628 }
629
630
eap_fast_get_phase2_key(struct eap_sm * sm,struct eap_fast_data * data,u8 * isk,size_t isk_len)631 static int eap_fast_get_phase2_key(struct eap_sm *sm,
632 struct eap_fast_data *data,
633 u8 *isk, size_t isk_len)
634 {
635 u8 *key;
636 size_t key_len;
637
638 os_memset(isk, 0, isk_len);
639
640 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
641 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
642 "available");
643 return -1;
644 }
645
646 if (data->phase2_method->isKeyAvailable == NULL ||
647 data->phase2_method->getKey == NULL)
648 return 0;
649
650 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
651 (key = data->phase2_method->getKey(sm, data->phase2_priv,
652 &key_len)) == NULL) {
653 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
654 "from Phase 2");
655 return -1;
656 }
657
658 if (key_len > isk_len)
659 key_len = isk_len;
660 if (key_len == 32 &&
661 data->phase2_method->vendor == EAP_VENDOR_IETF &&
662 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
663 /*
664 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
665 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
666 * ISK for EAP-FAST cryptobinding.
667 */
668 os_memcpy(isk, key + 16, 16);
669 os_memcpy(isk + 16, key, 16);
670 } else
671 os_memcpy(isk, key, key_len);
672 os_free(key);
673
674 return 0;
675 }
676
677
eap_fast_get_cmk(struct eap_sm * sm,struct eap_fast_data * data,u8 * cmk)678 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
679 u8 *cmk)
680 {
681 u8 isk[32], imck[60];
682
683 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
684 "calculation", data->simck_idx + 1);
685
686 /*
687 * RFC 4851, Section 5.2:
688 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
689 * MSK[j], 60)
690 * S-IMCK[j] = first 40 octets of IMCK[j]
691 * CMK[j] = last 20 octets of IMCK[j]
692 */
693
694 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
695 return -1;
696 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
697 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
698 "Inner Methods Compound Keys",
699 isk, sizeof(isk), imck, sizeof(imck));
700 data->simck_idx++;
701 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
702 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
703 data->simck, EAP_FAST_SIMCK_LEN);
704 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
705 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
706 cmk, EAP_FAST_CMK_LEN);
707
708 return 0;
709 }
710
711
eap_fast_write_pac_request(u8 * pos,u16 pac_type)712 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
713 {
714 struct eap_tlv_hdr *pac;
715 struct eap_tlv_request_action_tlv *act;
716 struct eap_tlv_pac_type_tlv *type;
717
718 act = (struct eap_tlv_request_action_tlv *) pos;
719 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
720 act->length = host_to_be16(2);
721 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
722
723 pac = (struct eap_tlv_hdr *) (act + 1);
724 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
725 pac->length = host_to_be16(sizeof(*type));
726
727 type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
728 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
729 type->length = host_to_be16(2);
730 type->pac_type = host_to_be16(pac_type);
731
732 return (u8 *) (type + 1);
733 }
734
735
eap_fast_process_crypto_binding(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,struct eap_tlv_crypto_binding_tlv * _bind,size_t bind_len)736 static struct wpabuf * eap_fast_process_crypto_binding(
737 struct eap_sm *sm, struct eap_fast_data *data,
738 struct eap_method_ret *ret,
739 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
740 {
741 struct wpabuf *resp;
742 u8 *pos;
743 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
744 int res;
745 size_t len;
746
747 if (eap_fast_validate_crypto_binding(_bind) < 0)
748 return NULL;
749
750 if (eap_fast_get_cmk(sm, data, cmk) < 0)
751 return NULL;
752
753 /* Validate received Compound MAC */
754 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
755 os_memset(_bind->compound_mac, 0, sizeof(cmac));
756 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
757 "MAC calculation", (u8 *) _bind, bind_len);
758 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
759 _bind->compound_mac);
760 res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac));
761 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
762 cmac, sizeof(cmac));
763 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
764 _bind->compound_mac, sizeof(cmac));
765 if (res != 0) {
766 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
767 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
768 return NULL;
769 }
770
771 /*
772 * Compound MAC was valid, so authentication succeeded. Reply with
773 * crypto binding to allow server to complete authentication.
774 */
775
776 len = sizeof(struct eap_tlv_crypto_binding_tlv);
777 resp = wpabuf_alloc(len);
778 if (resp == NULL)
779 return NULL;
780
781 if (!data->anon_provisioning && data->phase2_success &&
782 eap_fast_derive_msk(data) < 0) {
783 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
784 ret->methodState = METHOD_DONE;
785 ret->decision = DECISION_FAIL;
786 data->phase2_success = 0;
787 wpabuf_free(resp);
788 return NULL;
789 }
790
791 if (!data->anon_provisioning && data->phase2_success) {
792 os_free(data->session_id);
793 data->session_id = eap_peer_tls_derive_session_id(
794 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len);
795 if (data->session_id) {
796 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id",
797 data->session_id, data->id_len);
798 } else {
799 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive "
800 "Session-Id");
801 wpabuf_free(resp);
802 return NULL;
803 }
804 }
805
806 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
807 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
808 pos, _bind, cmk);
809
810 return resp;
811 }
812
813
eap_fast_parse_pac_tlv(struct eap_fast_pac * entry,int type,u8 * pos,size_t len,int * pac_key_found)814 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
815 u8 *pos, size_t len, int *pac_key_found)
816 {
817 switch (type & 0x7fff) {
818 case PAC_TYPE_PAC_KEY:
819 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
820 if (len != EAP_FAST_PAC_KEY_LEN) {
821 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
822 "length %lu", (unsigned long) len);
823 break;
824 }
825 *pac_key_found = 1;
826 os_memcpy(entry->pac_key, pos, len);
827 break;
828 case PAC_TYPE_PAC_OPAQUE:
829 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
830 entry->pac_opaque = pos;
831 entry->pac_opaque_len = len;
832 break;
833 case PAC_TYPE_PAC_INFO:
834 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
835 entry->pac_info = pos;
836 entry->pac_info_len = len;
837 break;
838 default:
839 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
840 type);
841 break;
842 }
843 }
844
845
eap_fast_process_pac_tlv(struct eap_fast_pac * entry,u8 * pac,size_t pac_len)846 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
847 u8 *pac, size_t pac_len)
848 {
849 struct pac_tlv_hdr *hdr;
850 u8 *pos;
851 size_t left, len;
852 int type, pac_key_found = 0;
853
854 pos = pac;
855 left = pac_len;
856
857 while (left > sizeof(*hdr)) {
858 hdr = (struct pac_tlv_hdr *) pos;
859 type = be_to_host16(hdr->type);
860 len = be_to_host16(hdr->len);
861 pos += sizeof(*hdr);
862 left -= sizeof(*hdr);
863 if (len > left) {
864 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
865 "(type=%d len=%lu left=%lu)",
866 type, (unsigned long) len,
867 (unsigned long) left);
868 return -1;
869 }
870
871 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
872
873 pos += len;
874 left -= len;
875 }
876
877 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
878 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
879 "all the required fields");
880 return -1;
881 }
882
883 return 0;
884 }
885
886
eap_fast_parse_pac_info(struct eap_fast_pac * entry,int type,u8 * pos,size_t len)887 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
888 u8 *pos, size_t len)
889 {
890 u16 pac_type;
891 u32 lifetime;
892 struct os_time now;
893
894 switch (type & 0x7fff) {
895 case PAC_TYPE_CRED_LIFETIME:
896 if (len != 4) {
897 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
898 "Invalid CRED_LIFETIME length - ignored",
899 pos, len);
900 return 0;
901 }
902
903 /*
904 * This is not currently saved separately in PAC files since
905 * the server can automatically initiate PAC update when
906 * needed. Anyway, the information is available from PAC-Info
907 * dump if it is needed for something in the future.
908 */
909 lifetime = WPA_GET_BE32(pos);
910 os_get_time(&now);
911 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
912 "(%d days)",
913 lifetime, (lifetime - (u32) now.sec) / 86400);
914 break;
915 case PAC_TYPE_A_ID:
916 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
917 pos, len);
918 entry->a_id = pos;
919 entry->a_id_len = len;
920 break;
921 case PAC_TYPE_I_ID:
922 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
923 pos, len);
924 entry->i_id = pos;
925 entry->i_id_len = len;
926 break;
927 case PAC_TYPE_A_ID_INFO:
928 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
929 pos, len);
930 entry->a_id_info = pos;
931 entry->a_id_info_len = len;
932 break;
933 case PAC_TYPE_PAC_TYPE:
934 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
935 if (len != 2) {
936 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
937 "length %lu (expected 2)",
938 (unsigned long) len);
939 wpa_hexdump_ascii(MSG_DEBUG,
940 "EAP-FAST: PAC-Info - PAC-Type",
941 pos, len);
942 return -1;
943 }
944 pac_type = WPA_GET_BE16(pos);
945 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
946 pac_type != PAC_TYPE_USER_AUTHORIZATION &&
947 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
948 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
949 "%d", pac_type);
950 return -1;
951 }
952
953 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
954 pac_type);
955 entry->pac_type = pac_type;
956 break;
957 default:
958 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
959 "type %d", type);
960 break;
961 }
962
963 return 0;
964 }
965
966
eap_fast_process_pac_info(struct eap_fast_pac * entry)967 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
968 {
969 struct pac_tlv_hdr *hdr;
970 u8 *pos;
971 size_t left, len;
972 int type;
973
974 /* RFC 5422, Section 4.2.4 */
975
976 /* PAC-Type defaults to Tunnel PAC (Type 1) */
977 entry->pac_type = PAC_TYPE_TUNNEL_PAC;
978
979 pos = entry->pac_info;
980 left = entry->pac_info_len;
981 while (left > sizeof(*hdr)) {
982 hdr = (struct pac_tlv_hdr *) pos;
983 type = be_to_host16(hdr->type);
984 len = be_to_host16(hdr->len);
985 pos += sizeof(*hdr);
986 left -= sizeof(*hdr);
987 if (len > left) {
988 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
989 "(type=%d len=%lu left=%lu)",
990 type, (unsigned long) len,
991 (unsigned long) left);
992 return -1;
993 }
994
995 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
996 return -1;
997
998 pos += len;
999 left -= len;
1000 }
1001
1002 if (entry->a_id == NULL || entry->a_id_info == NULL) {
1003 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
1004 "all the required fields");
1005 return -1;
1006 }
1007
1008 return 0;
1009 }
1010
1011
eap_fast_process_pac(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,u8 * pac,size_t pac_len)1012 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
1013 struct eap_fast_data *data,
1014 struct eap_method_ret *ret,
1015 u8 *pac, size_t pac_len)
1016 {
1017 struct eap_peer_config *config = eap_get_config(sm);
1018 struct eap_fast_pac entry;
1019
1020 os_memset(&entry, 0, sizeof(entry));
1021 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1022 eap_fast_process_pac_info(&entry))
1023 return NULL;
1024
1025 eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1026 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1027 if (data->use_pac_binary_format)
1028 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1029 else
1030 eap_fast_save_pac(sm, data->pac, config->pac_file);
1031
1032 if (data->provisioning) {
1033 if (data->anon_provisioning) {
1034 /*
1035 * Unauthenticated provisioning does not provide keying
1036 * material and must end with an EAP-Failure.
1037 * Authentication will be done separately after this.
1038 */
1039 data->success = 0;
1040 ret->decision = DECISION_FAIL;
1041 } else {
1042 /*
1043 * Server may or may not allow authenticated
1044 * provisioning also for key generation.
1045 */
1046 ret->decision = DECISION_COND_SUCC;
1047 }
1048 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1049 "- Provisioning completed successfully");
1050 } else {
1051 /*
1052 * This is PAC refreshing, i.e., normal authentication that is
1053 * expected to be completed with an EAP-Success. However,
1054 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even
1055 * after protected success exchange in case of EAP-Fast
1056 * provisioning, so we better use DECISION_COND_SUCC here
1057 * instead of DECISION_UNCOND_SUCC.
1058 */
1059 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1060 "- PAC refreshing completed successfully");
1061 ret->decision = DECISION_COND_SUCC;
1062 }
1063 ret->methodState = METHOD_DONE;
1064 return eap_fast_tlv_pac_ack();
1065 }
1066
1067
eap_fast_parse_decrypted(struct wpabuf * decrypted,struct eap_fast_tlv_parse * tlv,struct wpabuf ** resp)1068 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1069 struct eap_fast_tlv_parse *tlv,
1070 struct wpabuf **resp)
1071 {
1072 int mandatory, tlv_type, len, res;
1073 u8 *pos, *end;
1074
1075 os_memset(tlv, 0, sizeof(*tlv));
1076
1077 /* Parse TLVs from the decrypted Phase 2 data */
1078 pos = wpabuf_mhead(decrypted);
1079 end = pos + wpabuf_len(decrypted);
1080 while (pos + 4 < end) {
1081 mandatory = pos[0] & 0x80;
1082 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1083 pos += 2;
1084 len = WPA_GET_BE16(pos);
1085 pos += 2;
1086 if (pos + len > end) {
1087 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1088 return -1;
1089 }
1090 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1091 "TLV type %d length %d%s",
1092 tlv_type, len, mandatory ? " (mandatory)" : "");
1093
1094 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1095 if (res == -2)
1096 break;
1097 if (res < 0) {
1098 if (mandatory) {
1099 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1100 "mandatory TLV type %d", tlv_type);
1101 *resp = eap_fast_tlv_nak(0, tlv_type);
1102 break;
1103 } else {
1104 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1105 "unknown optional TLV type %d",
1106 tlv_type);
1107 }
1108 }
1109
1110 pos += len;
1111 }
1112
1113 return 0;
1114 }
1115
1116
eap_fast_encrypt_response(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * resp,u8 identifier,struct wpabuf ** out_data)1117 static int eap_fast_encrypt_response(struct eap_sm *sm,
1118 struct eap_fast_data *data,
1119 struct wpabuf *resp,
1120 u8 identifier, struct wpabuf **out_data)
1121 {
1122 if (resp == NULL)
1123 return 0;
1124
1125 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1126 resp);
1127 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1128 data->fast_version, identifier,
1129 resp, out_data)) {
1130 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1131 "frame");
1132 }
1133 wpabuf_free(resp);
1134
1135 return 0;
1136 }
1137
1138
eap_fast_pac_request(void)1139 static struct wpabuf * eap_fast_pac_request(void)
1140 {
1141 struct wpabuf *tmp;
1142 u8 *pos, *pos2;
1143
1144 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1145 sizeof(struct eap_tlv_request_action_tlv) +
1146 sizeof(struct eap_tlv_pac_type_tlv));
1147 if (tmp == NULL)
1148 return NULL;
1149
1150 pos = wpabuf_put(tmp, 0);
1151 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1152 wpabuf_put(tmp, pos2 - pos);
1153 return tmp;
1154 }
1155
1156
eap_fast_process_decrypted(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,const struct eap_hdr * req,struct wpabuf * decrypted,struct wpabuf ** out_data)1157 static int eap_fast_process_decrypted(struct eap_sm *sm,
1158 struct eap_fast_data *data,
1159 struct eap_method_ret *ret,
1160 const struct eap_hdr *req,
1161 struct wpabuf *decrypted,
1162 struct wpabuf **out_data)
1163 {
1164 struct wpabuf *resp = NULL, *tmp;
1165 struct eap_fast_tlv_parse tlv;
1166 int failed = 0;
1167
1168 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1169 return 0;
1170 if (resp)
1171 return eap_fast_encrypt_response(sm, data, resp,
1172 req->identifier, out_data);
1173
1174 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1175 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1176 return eap_fast_encrypt_response(sm, data, resp,
1177 req->identifier, out_data);
1178 }
1179
1180 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1181 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1182 return eap_fast_encrypt_response(sm, data, resp,
1183 req->identifier, out_data);
1184 }
1185
1186 if (tlv.crypto_binding) {
1187 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1188 tlv.crypto_binding,
1189 tlv.crypto_binding_len);
1190 if (tmp == NULL)
1191 failed = 1;
1192 else
1193 resp = wpabuf_concat(resp, tmp);
1194 }
1195
1196 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1197 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1198 EAP_TLV_RESULT_SUCCESS, 1);
1199 resp = wpabuf_concat(resp, tmp);
1200 }
1201
1202 if (tlv.eap_payload_tlv) {
1203 tmp = eap_fast_process_eap_payload_tlv(
1204 sm, data, ret, tlv.eap_payload_tlv,
1205 tlv.eap_payload_tlv_len);
1206 resp = wpabuf_concat(resp, tmp);
1207 }
1208
1209 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1210 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1211 "acknowledging success");
1212 failed = 1;
1213 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1214 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1215 tlv.pac_len);
1216 resp = wpabuf_concat(resp, tmp);
1217 }
1218
1219 if (data->current_pac == NULL && data->provisioning &&
1220 !data->anon_provisioning && !tlv.pac &&
1221 (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1222 tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1223 /*
1224 * Need to request Tunnel PAC when using authenticated
1225 * provisioning.
1226 */
1227 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1228 tmp = eap_fast_pac_request();
1229 resp = wpabuf_concat(resp, tmp);
1230 }
1231
1232 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1233 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1234 resp = wpabuf_concat(tmp, resp);
1235 } else if (failed) {
1236 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1237 resp = wpabuf_concat(tmp, resp);
1238 }
1239
1240 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1241 tlv.crypto_binding && data->phase2_success) {
1242 if (data->anon_provisioning) {
1243 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1244 "provisioning completed successfully.");
1245 ret->methodState = METHOD_DONE;
1246 ret->decision = DECISION_FAIL;
1247 } else {
1248 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1249 "completed successfully.");
1250 if (data->provisioning)
1251 ret->methodState = METHOD_MAY_CONT;
1252 else
1253 ret->methodState = METHOD_DONE;
1254 ret->decision = DECISION_UNCOND_SUCC;
1255 }
1256 }
1257
1258 if (resp == NULL) {
1259 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1260 "empty response packet");
1261 resp = wpabuf_alloc(1);
1262 }
1263
1264 return eap_fast_encrypt_response(sm, data, resp, req->identifier,
1265 out_data);
1266 }
1267
1268
eap_fast_decrypt(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,const struct eap_hdr * req,const struct wpabuf * in_data,struct wpabuf ** out_data)1269 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1270 struct eap_method_ret *ret,
1271 const struct eap_hdr *req,
1272 const struct wpabuf *in_data,
1273 struct wpabuf **out_data)
1274 {
1275 struct wpabuf *in_decrypted;
1276 int res;
1277
1278 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1279 " Phase 2", (unsigned long) wpabuf_len(in_data));
1280
1281 if (data->pending_phase2_req) {
1282 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1283 "skip decryption and use old data");
1284 /* Clear TLS reassembly state. */
1285 eap_peer_tls_reset_input(&data->ssl);
1286
1287 in_decrypted = data->pending_phase2_req;
1288 data->pending_phase2_req = NULL;
1289 goto continue_req;
1290 }
1291
1292 if (wpabuf_len(in_data) == 0) {
1293 /* Received TLS ACK - requesting more fragments */
1294 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1295 data->fast_version,
1296 req->identifier, NULL, out_data);
1297 }
1298
1299 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1300 if (res)
1301 return res;
1302
1303 continue_req:
1304 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1305 in_decrypted);
1306
1307 if (wpabuf_len(in_decrypted) < 4) {
1308 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1309 "TLV frame (len=%lu)",
1310 (unsigned long) wpabuf_len(in_decrypted));
1311 wpabuf_free(in_decrypted);
1312 return -1;
1313 }
1314
1315 res = eap_fast_process_decrypted(sm, data, ret, req,
1316 in_decrypted, out_data);
1317
1318 wpabuf_free(in_decrypted);
1319
1320 return res;
1321 }
1322
1323
eap_fast_get_a_id(const u8 * buf,size_t len,size_t * id_len)1324 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1325 {
1326 const u8 *a_id;
1327 struct pac_tlv_hdr *hdr;
1328
1329 /*
1330 * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1331 * supports both raw A-ID and one inside an A-ID TLV.
1332 */
1333 a_id = buf;
1334 *id_len = len;
1335 if (len > sizeof(*hdr)) {
1336 int tlen;
1337 hdr = (struct pac_tlv_hdr *) buf;
1338 tlen = be_to_host16(hdr->len);
1339 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1340 sizeof(*hdr) + tlen <= len) {
1341 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1342 "(Start)");
1343 a_id = (u8 *) (hdr + 1);
1344 *id_len = tlen;
1345 }
1346 }
1347 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1348
1349 return a_id;
1350 }
1351
1352
eap_fast_select_pac(struct eap_fast_data * data,const u8 * a_id,size_t a_id_len)1353 static void eap_fast_select_pac(struct eap_fast_data *data,
1354 const u8 *a_id, size_t a_id_len)
1355 {
1356 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1357 PAC_TYPE_TUNNEL_PAC);
1358 if (data->current_pac == NULL) {
1359 /*
1360 * Tunnel PAC was not available for this A-ID. Try to use
1361 * Machine Authentication PAC, if one is available.
1362 */
1363 data->current_pac = eap_fast_get_pac(
1364 data->pac, a_id, a_id_len,
1365 PAC_TYPE_MACHINE_AUTHENTICATION);
1366 }
1367
1368 if (data->current_pac) {
1369 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1370 "(PAC-Type %d)", data->current_pac->pac_type);
1371 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1372 data->current_pac->a_id_info,
1373 data->current_pac->a_id_info_len);
1374 }
1375 }
1376
1377
eap_fast_use_pac_opaque(struct eap_sm * sm,struct eap_fast_data * data,struct eap_fast_pac * pac)1378 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1379 struct eap_fast_data *data,
1380 struct eap_fast_pac *pac)
1381 {
1382 u8 *tlv;
1383 size_t tlv_len, olen;
1384 struct eap_tlv_hdr *ehdr;
1385
1386 olen = pac->pac_opaque_len;
1387 tlv_len = sizeof(*ehdr) + olen;
1388 tlv = os_malloc(tlv_len);
1389 if (tlv) {
1390 ehdr = (struct eap_tlv_hdr *) tlv;
1391 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1392 ehdr->length = host_to_be16(olen);
1393 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1394 }
1395 if (tlv == NULL ||
1396 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1397 TLS_EXT_PAC_OPAQUE,
1398 tlv, tlv_len) < 0) {
1399 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1400 "extension");
1401 os_free(tlv);
1402 return -1;
1403 }
1404 os_free(tlv);
1405
1406 return 0;
1407 }
1408
1409
eap_fast_clear_pac_opaque_ext(struct eap_sm * sm,struct eap_fast_data * data)1410 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1411 struct eap_fast_data *data)
1412 {
1413 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1414 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1415 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1416 "TLS extension");
1417 return -1;
1418 }
1419 return 0;
1420 }
1421
1422
eap_fast_set_provisioning_ciphers(struct eap_sm * sm,struct eap_fast_data * data)1423 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1424 struct eap_fast_data *data)
1425 {
1426 u8 ciphers[5];
1427 int count = 0;
1428
1429 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1430 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1431 "provisioning TLS cipher suites");
1432 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1433 }
1434
1435 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1436 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1437 "provisioning TLS cipher suites");
1438 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1439 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1440 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1441 }
1442
1443 ciphers[count++] = TLS_CIPHER_NONE;
1444
1445 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1446 ciphers)) {
1447 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1448 "cipher suites for provisioning");
1449 return -1;
1450 }
1451
1452 return 0;
1453 }
1454
1455
eap_fast_process_start(struct eap_sm * sm,struct eap_fast_data * data,u8 flags,const u8 * pos,size_t left)1456 static int eap_fast_process_start(struct eap_sm *sm,
1457 struct eap_fast_data *data, u8 flags,
1458 const u8 *pos, size_t left)
1459 {
1460 const u8 *a_id;
1461 size_t a_id_len;
1462
1463 /* EAP-FAST Version negotiation (section 3.1) */
1464 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1465 flags & EAP_TLS_VERSION_MASK, data->fast_version);
1466 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
1467 data->fast_version = flags & EAP_TLS_VERSION_MASK;
1468 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1469 data->fast_version);
1470
1471 a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1472 eap_fast_select_pac(data, a_id, a_id_len);
1473
1474 if (data->resuming && data->current_pac) {
1475 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1476 "do not add PAC-Opaque to TLS ClientHello");
1477 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1478 return -1;
1479 } else if (data->current_pac) {
1480 /*
1481 * PAC found for the A-ID and we are not resuming an old
1482 * session, so add PAC-Opaque extension to ClientHello.
1483 */
1484 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1485 return -1;
1486 } else {
1487 /* No PAC found, so we must provision one. */
1488 if (!data->provisioning_allowed) {
1489 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1490 "provisioning disabled");
1491 return -1;
1492 }
1493 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1494 "starting provisioning");
1495 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1496 eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1497 return -1;
1498 data->provisioning = 1;
1499 }
1500
1501 return 0;
1502 }
1503
1504
eap_fast_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1505 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1506 struct eap_method_ret *ret,
1507 const struct wpabuf *reqData)
1508 {
1509 const struct eap_hdr *req;
1510 size_t left;
1511 int res;
1512 u8 flags, id;
1513 struct wpabuf *resp;
1514 const u8 *pos;
1515 struct eap_fast_data *data = priv;
1516
1517 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1518 reqData, &left, &flags);
1519 if (pos == NULL)
1520 return NULL;
1521
1522 req = wpabuf_head(reqData);
1523 id = req->identifier;
1524
1525 if (flags & EAP_TLS_FLAGS_START) {
1526 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1527 return NULL;
1528
1529 left = 0; /* A-ID is not used in further packet processing */
1530 }
1531
1532 resp = NULL;
1533 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1534 !data->resuming) {
1535 /* Process tunneled (encrypted) phase 2 data. */
1536 struct wpabuf msg;
1537 wpabuf_set(&msg, pos, left);
1538 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
1539 if (res < 0) {
1540 ret->methodState = METHOD_DONE;
1541 ret->decision = DECISION_FAIL;
1542 /*
1543 * Ack possible Alert that may have caused failure in
1544 * decryption.
1545 */
1546 res = 1;
1547 }
1548 } else {
1549 /* Continue processing TLS handshake (phase 1). */
1550 res = eap_peer_tls_process_helper(sm, &data->ssl,
1551 EAP_TYPE_FAST,
1552 data->fast_version, id, pos,
1553 left, &resp);
1554
1555 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1556 char cipher[80];
1557 wpa_printf(MSG_DEBUG,
1558 "EAP-FAST: TLS done, proceed to Phase 2");
1559 if (data->provisioning &&
1560 (!(data->provisioning_allowed &
1561 EAP_FAST_PROV_AUTH) ||
1562 tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1563 cipher, sizeof(cipher)) < 0 ||
1564 os_strstr(cipher, "ADH-") ||
1565 os_strstr(cipher, "anon"))) {
1566 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1567 "anonymous (unauthenticated) "
1568 "provisioning");
1569 data->anon_provisioning = 1;
1570 } else
1571 data->anon_provisioning = 0;
1572 data->resuming = 0;
1573 eap_fast_derive_keys(sm, data);
1574 }
1575
1576 if (res == 2) {
1577 struct wpabuf msg;
1578 /*
1579 * Application data included in the handshake message.
1580 */
1581 wpabuf_free(data->pending_phase2_req);
1582 data->pending_phase2_req = resp;
1583 resp = NULL;
1584 wpabuf_set(&msg, pos, left);
1585 res = eap_fast_decrypt(sm, data, ret, req, &msg,
1586 &resp);
1587 }
1588 }
1589
1590 if (res == 1) {
1591 wpabuf_free(resp);
1592 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1593 data->fast_version);
1594 }
1595
1596 return resp;
1597 }
1598
1599
1600 #if 0 /* FIX */
1601 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1602 {
1603 struct eap_fast_data *data = priv;
1604 return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1605 }
1606
1607
1608 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1609 {
1610 struct eap_fast_data *data = priv;
1611 os_free(data->key_block_p);
1612 data->key_block_p = NULL;
1613 wpabuf_free(data->pending_phase2_req);
1614 data->pending_phase2_req = NULL;
1615 }
1616
1617
1618 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1619 {
1620 struct eap_fast_data *data = priv;
1621 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1622 os_free(data);
1623 return NULL;
1624 }
1625 os_free(data->session_id);
1626 data->session_id = NULL;
1627 if (data->phase2_priv && data->phase2_method &&
1628 data->phase2_method->init_for_reauth)
1629 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1630 data->phase2_success = 0;
1631 data->resuming = 1;
1632 data->provisioning = 0;
1633 data->anon_provisioning = 0;
1634 data->simck_idx = 0;
1635 return priv;
1636 }
1637 #endif
1638
1639
eap_fast_get_status(struct eap_sm * sm,void * priv,char * buf,size_t buflen,int verbose)1640 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1641 size_t buflen, int verbose)
1642 {
1643 struct eap_fast_data *data = priv;
1644 int len, ret;
1645
1646 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1647 if (data->phase2_method) {
1648 ret = os_snprintf(buf + len, buflen - len,
1649 "EAP-FAST Phase2 method=%s\n",
1650 data->phase2_method->name);
1651 if (ret < 0 || (size_t) ret >= buflen - len)
1652 return len;
1653 len += ret;
1654 }
1655 return len;
1656 }
1657
1658
eap_fast_isKeyAvailable(struct eap_sm * sm,void * priv)1659 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1660 {
1661 struct eap_fast_data *data = priv;
1662 return data->success;
1663 }
1664
1665
eap_fast_getKey(struct eap_sm * sm,void * priv,size_t * len)1666 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1667 {
1668 struct eap_fast_data *data = priv;
1669 u8 *key;
1670
1671 if (!data->success)
1672 return NULL;
1673
1674 key = os_malloc(EAP_FAST_KEY_LEN);
1675 if (key == NULL)
1676 return NULL;
1677
1678 *len = EAP_FAST_KEY_LEN;
1679 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
1680
1681 return key;
1682 }
1683
1684
eap_fast_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1685 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1686 {
1687 struct eap_fast_data *data = priv;
1688 u8 *id;
1689
1690 if (!data->success)
1691 return NULL;
1692
1693 id = os_malloc(data->id_len);
1694 if (id == NULL)
1695 return NULL;
1696
1697 *len = data->id_len;
1698 os_memcpy(id, data->session_id, data->id_len);
1699
1700 return id;
1701 }
1702
1703
eap_fast_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1704 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1705 {
1706 struct eap_fast_data *data = priv;
1707 u8 *key;
1708
1709 if (!data->success)
1710 return NULL;
1711
1712 key = os_malloc(EAP_EMSK_LEN);
1713 if (key == NULL)
1714 return NULL;
1715
1716 *len = EAP_EMSK_LEN;
1717 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1718
1719 return key;
1720 }
1721
1722
eap_peer_fast_register(void)1723 int eap_peer_fast_register(void)
1724 {
1725 struct eap_method *eap;
1726 int ret;
1727
1728 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1729 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1730 if (eap == NULL)
1731 return -1;
1732
1733 eap->init = eap_fast_init;
1734 eap->deinit = eap_fast_deinit;
1735 eap->process = eap_fast_process;
1736 eap->isKeyAvailable = eap_fast_isKeyAvailable;
1737 eap->getKey = eap_fast_getKey;
1738 eap->getSessionId = eap_fast_get_session_id;
1739 eap->get_status = eap_fast_get_status;
1740 #if 0
1741 eap->has_reauth_data = eap_fast_has_reauth_data;
1742 eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1743 eap->init_for_reauth = eap_fast_init_for_reauth;
1744 #endif
1745 eap->get_emsk = eap_fast_get_emsk;
1746
1747 ret = eap_peer_method_register(eap);
1748 if (ret)
1749 eap_peer_method_free(eap);
1750 return ret;
1751 }
1752